Influence of spatial correlation of core strength measurements on the assessment of in situ concrete strength

Bonfigli, Massimo Federico; Materazzi, Annibale Luigi

doi:10.1016/j.strusafe.2017.05.005

Cited by 12 publications

(2 citation statements)

References 23 publications

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“…For the correlation length c in the ACF, the accurate determination is still somewhat an unsolved issue due to insufficient experiment data. For example, the correlation length of concrete properties presents distinct differences (Bonfigli et al., 2017; Xu & Li, 2018). Meanwhile, many researchers adopt random variables to consider the intrinsic uncertainty, which is corresponding to the random field with an infinite correlation length.…”

Section: Application Examplesmentioning

confidence: 99%

Three‐stage non‐Gaussian homogeneous random field representation over manifolds

Liang

Feng

Ren

et al. 2022

Computer aided Civil Eng

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Random fields are widely used to characterize the inherent spatial uncertainty in engineering applications. However, for widely existing manifolds, few studies focus on the simulation of Gaussian/non-Gaussian fields over manifolds due to the geometry complexity. Recently, we proposed a two-stage method to simulate Gaussian fields over manifolds. In this study, we extend it to a three-stage method for non-Gaussian fields. In the first stage, the original manifold is dimensional reduced to a Euclidean domain by the isometric feature mapping. By this step, the geodesic distance is preserved to guarantee the correlation structure unchanged. In the second stage, conventional representations can be used to simulate the underlying Gaussian field over the Euclidean domain. In the third stage, an enhanced translation procedure is proposed to translate the underlying Gaussian field to the target non-Gaussian field over the manifold. To explain the applicability and accuracy of the three-stage method, two kinds of non-Gaussian fields over three different manifolds are simulated. Then, a global error is proposed to evaluate the performance of the method, and the error analysis demonstrates the method is accurate enough. Finally, two engineering structures, that is, a compressed half-cylinder and a Canopy shell with complex geometry, are investigated to illustrate the potential applications of the method. INTRODUCTIONInherent uncertainties widely exist in many engineering applications, such as earthquake ground motion, fluid mechanics, acoustic propagation, heat transfer, multiscale modeling of materials, and civil and environmental engineering. These uncertainties should be considered in the design and analysis procedures (Feng & Li, 2016). Then, how to quantify these uncertainties is a crucial issue in actual engineering applications. When the uncertainty is spatial-related, it is generally considered as a random field/process. A random field can be deemed as a set of variables defined on a geometry domain. The mean, variance,

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Section: Application Examplesmentioning

confidence: 99%

Three‐stage non‐Gaussian homogeneous random field representation over manifolds

Liang

Feng

Ren

et al. 2022

Computer aided Civil Eng

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“…Any assessment begins with a survey of the structural system and of the existing documentation, which may contain information also on the materials that had been used for the construction. However, often many a times, these documents have been lost or may be unreliable, so that an experimental evaluation of the material properties is almost always required (Bonfigli et al, 2017). The assessment process determines the depth and extent of damage (spalling and delamination), loss in strength of the concrete, loss in strength of steel reinforcement, damage or distress to the structure from movement, because of imposed loads.…”

Section: Introductionmentioning

confidence: 99%

Core recovery: a damage diagnosis tool for thermally deteriorated concrete

Kulkarni

Yaragal

Narayan

2019

JSFE

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Purpose This paper aims to study and assess residual strengths of concrete specimen exposed to elevated temperatures by core recovery tests. Design/methodology/approach The appraisal of concrete structures is typically carried out by means of partially destructive tests such as tests on concrete cores taken from the structure and non-destructive testing. Findings This paper presents results associated with determination of residual compressive strengths of plain and reinforced concrete elements exposed to elevated temperatures by core recovery test. Physical observations and results of compressive strengths of cores extracted from plain cement concrete, as well as from reinforced concrete beam elements exposed to elevated temperatures, have been presented. Originality/value The empirical relations have been proposed between standard cube and core extracted for compressive strength of concretes exposed to elevated temperatures are useful for damage diagnosis.

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